The following commit has been merged into the x86/apic branch of tip:
Commit-ID: 6452ea2a323b80868ce5e6d3030e4ccbeab9dc30
Gitweb: https://git.kernel.org/tip/6452ea2a323b80868ce5e6d3030e4ccbeab9dc30
Author: David Woodhouse <dwmw@xxxxxxxxxxxx>
AuthorDate: Sat, 24 Oct 2020 22:35:23 +01:00
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Wed, 28 Oct 2020 20:26:27 +01:00
x86/apic: Add select() method on vector irqdomain
This will be used to select the irqdomain for I/O-APIC and HPET.
Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20201024213535.443185-24-dwmw2@xxxxxxxxxxxxx
---
arch/x86/include/asm/irqdomain.h | 3 ++-
arch/x86/kernel/apic/vector.c | 43 +++++++++++++++++++++++++++++++-
2 files changed, 46 insertions(+)
diff --git a/arch/x86/include/asm/irqdomain.h b/arch/x86/include/asm/irqdomain.h
index cd684d4..125c23b 100644
--- a/arch/x86/include/asm/irqdomain.h
+++ b/arch/x86/include/asm/irqdomain.h
@@ -12,6 +12,9 @@ enum {
X86_IRQ_ALLOC_LEGACY = 0x2,
};
+extern int x86_fwspec_is_ioapic(struct irq_fwspec *fwspec);
+extern int x86_fwspec_is_hpet(struct irq_fwspec *fwspec);
+
extern struct irq_domain *x86_vector_domain;
extern void init_irq_alloc_info(struct irq_alloc_info *info,
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index bb2e2a2..b9b05ca 100644
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -636,7 +636,50 @@ static void x86_vector_debug_show(struct seq_file *m, struct irq_domain *d,
}
#endif
+int x86_fwspec_is_ioapic(struct irq_fwspec *fwspec)
+{
+ if (fwspec->param_count != 1)
+ return 0;
+
+ if (is_fwnode_irqchip(fwspec->fwnode)) {
+ const char *fwname = fwnode_get_name(fwspec->fwnode);
+ return fwname && !strncmp(fwname, "IO-APIC-", 8) &&
+ simple_strtol(fwname+8, NULL, 10) == fwspec->param[0];
+ }
+ return to_of_node(fwspec->fwnode) &&
+ of_device_is_compatible(to_of_node(fwspec->fwnode),
+ "intel,ce4100-ioapic");
+}
+
+int x86_fwspec_is_hpet(struct irq_fwspec *fwspec)
+{
+ if (fwspec->param_count != 1)
+ return 0;
+
+ if (is_fwnode_irqchip(fwspec->fwnode)) {
+ const char *fwname = fwnode_get_name(fwspec->fwnode);
+ return fwname && !strncmp(fwname, "HPET-MSI-", 9) &&
+ simple_strtol(fwname+9, NULL, 10) == fwspec->param[0];
+ }
+ return 0;
+}
+
+static int x86_vector_select(struct irq_domain *d, struct irq_fwspec *fwspec,
+ enum irq_domain_bus_token bus_token)
+{
+ /*
+ * HPET and I/OAPIC cannot be parented in the vector domain
+ * if IRQ remapping is enabled. APIC IDs above 15 bits are
+ * only permitted if IRQ remapping is enabled, so check that.
+ */
+ if (apic->apic_id_valid(32768))
+ return 0;
+
+ return x86_fwspec_is_ioapic(fwspec) || x86_fwspec_is_hpet(fwspec);
+}
+
static const struct irq_domain_ops x86_vector_domain_ops = {
+ .select = x86_vector_select,
.alloc = x86_vector_alloc_irqs,
.free = x86_vector_free_irqs,
.activate = x86_vector_activate,
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